N-thiazolyl-oxodiazacycloalkanes

ABSTRACT

D R A W I N G

United States Patent 011 3,627,777

[72] inventors Paul Schmidt [52] U.S. Q! 260/3068 R, Therwil; 260/247.1, 260/2565 R, 260/268 H, 260/2914 Max Wilhelm, Allschwll; Kurt E, 260/2941; D, 260/999 Elchenbergcr, Therwil, all 0! Switzerland [5 l Int. Cl C07d 91/34 21] Appl. No. 873,666 50 Field of Search 260/3068 [22 Filed Nov. 3, 1969 R, 256.5 R, 247.1, 268 H, 293.4 E, 294.8 D [45] Patented Dec. 14, 1971 73 Assignee cum Corporation [561 References Summit, NJ. UNITED STATES PATENTS Priority y 30,1962 3,299,069 l/l967 Schmidt et al. 260 2565 Switzerland 3,503,989 3/1970 Schmidt et al. 260/306.8

Continuation-impart of application Ser. No. 594,403, Nov. 15, 1966, now Patent No. 3,503,989, which is a continuation-impart of application Ser. No. 564,536, July 12, 1966, now Patent No. 3,298,914, which is a nunulmmimpan application ABSTRACT: Compounds of the formula 485,927, Sept. 8, 1965, now Patent No. R1 3,299,069, which is a continuation-impart 1 J /Z\ N N-R 5 Primary Examiner-Alex Mazel Assistant Examiner-R. J. Gallagher Attorneys-Harry Goldsmith, Joseph G. Kolodny and Mario A. Monaco of application Ser. No. 447,868, Apr. 13,

1965, now abandoned which is a continuation-in-part of application Ser. No. H

391,294, Aug. 21, 1964, now abandoned o whicbislcomimwfion-ill-pafl of in which R represents a hydrogen atom or an optionally application 282,589, May substituted hydrocarbon radical, Z represents an optionally 1963, now aband This flllliuclflim substituted alkylene radical and R stands for a hydrogen 1969, 373,666 atom, an acyl radical, an optionally substituted hydrocarbon radical of aliphatic character, are valuable intermediates for the preparation of the corresponding S-nitrothiazolyl [54] yggr gzg fi i compounds which are valuable antiparasitic and anti- W bacterial agents.

N-THIAZOLYL-OXODIAZACYCLOALKANES CROSS-REFERENCE TO OTHER APPLICATIONS This is a continuation in part of our copending application Serl No. 594,403, filed Nov. 15, 1966 (now U.S. Pat. No. 3,503,989), which in turn is a continuation-in-part of our application Ser. No. 564,536, filed July 12, 1966 (now U.S. Pat. No. 3,298,914), which in turn is a continuation-in-part of our application Ser. No. 485,927, filed Sept. 8, 1965 (now U.S. Pat. No. 3,299,069), which in turn is a continuation-in-part of our application Ser. No. 447,868, filed Apr. 13, 1965 (now abandoned). which in turn is a continuation-in-part of our application Ser. No. 391,294, filed Aug. 21, 1964, (now abandoned), which in turn is a continuation-in-part of our application Ser. No. 282,589, filed May 23, 1963 (now abandoned).

SUMMARY OF THE INVENTION in which T represents a 5-nitrothiazolyl-2 radical; Z stands for a lower alkylene radical which separates the two nitrogen atoms by two to five, preferably by three or four but above all by two, carbon atoms and which may be substituted by one or several, possibly substituted, hydrocarbon radicals, and R represents a hydrogen atom, an acyl radical or an unsubstituted or substituted hydrocarbon radical ,of aliphatic character, above all a lower alkyl radical which is unsubstituted or substituted by a hydroxyl group or by a free or substituted amino group, or a lower alkenyl or an araliphatic radical and, as the case may be, their salts.

Particularly suitable as hydrocarbon radicals are lower alkyl, lower alkenyl, phenyl and phenyl-lower alkyl radicals such as benzylor phenylethyl radicals. These phenyl or phenyl-lower alkyl groups may be substituted especially by lower alkyl groups, lower alkoxy groups such as methoxy, ethoxy, propoxy or butoxy groups, or halogen atoms such as chlorine or bromine, trifluoromethyl groups or nitro groups.

In the foregoing and following lower alkyl radicals are preferably those which contain up to five carbon atoms, such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl or pentyl groups. Lower alkenyl radicals are above all allyl or methallyl radicals. As araliphatic radicals there may be mentioned above all phenyl-lower alkyl groups, such as benzyl, l-phenylethyl or Z-phenylethyl radicals. The araliphatic radicals may be substituted on the carbon atoms, especially on the aryl radicals by halogen atoms such as chlorine or bromine, the pseudohalogen trifluoromethyl, lower alkyls such as methyl or ethyl, by lower alkoxy groups such as methoxy, ethoxy or methylenedioxy or by nitro groups.

Substituted amino groups are monosubstituted or preferably disubstituted amino groups, and the substituents may be above all lower alkyl, lower alkenyl, lower cycloalkyl radicals, or alkylene, monooxaor monoazaalkylene radicals having from four to eight carbon atoms. There may be mentioned, for example, monoor di-lower alkylamino groups such as methylamino, ethylamino, dimethylamino, diethylamino, dipropylamino, cyclohexylamino, methylcyclohexylamino, ethyl-cyclopentylamino, diallylamino, allylethylamino or methallylamino groups, pyrrolidino, piperidino, morpholino, hexaor heptamethyleneamino, piperazino, N- lower alkyl piperazino or N-( hydroxy-lower alkyl)-piperazino groups such as N-methyl-piperazino or N-hydroxyethylpiperazino groups.

If the radical R represents a substituted lower alkyl radical it stands more especially for a hydroxyor tertiary amino-ethyl or -propyl radical, above all it represents a hydroxymethyl or a a ssxamissmsta lsteaa Particularly suitable acyl radicals are those of carboxylic acids, in the first place the acyl radicals of aliphatic carboxylic acids, such as lower alkanoic acids, for example propionic, butyric, trimethylacetic or valeric acid or above all acetic acid, or of substituted lower alkanoic acids, such as halogen-lower alkanoic acids, for example monoor dichloro-acetic acid or trifluoracetic acid. As further suitable acyl radicals there may be mentioned the radicals of aromatic or araliphatic carboxylic acids, such as those of benzoic acids or phenyl-lower alkaneor -alkene acids, for example phenylacetic acids, phenylpropionic acids, or cinnamic acids; also the acyl radicals of v heterocyclic carboxylic acids, for example of pyridine-, furanor thiophene-carboxylic acids. The aromatic or heterocyclic above for the phenyl groups.

The radical Z is especially an unsubstituted ethylene-(1,2)- radical or an ethylene-(1,2) radical substituted by lower alkyl radicals, or a propylene-( 1,2), buty1ene-( 1,4), or pentylene- 1,5 radical which may be substituted by lower alkyl radicals.

The new compounds possess valuable pharmacological, especially antiparasitic and antibacterial properties. They are primarily suitable for the treatment of protozoic and helminthic conditions, for example in infested animals, for example mice, against Gram-negative bacteria, for example Salmonella typhi or coli bacilli, such as Escherichia coli. As has been demonstrated by experiments on hamsters, for example, the new compounds are particularly effective against trichomonades and amoebae, and for example in mice and sheep against schistosomes. The new compounds also act I against coccidia. Accordingly, the new compounds may be used as antiparasitic and antibacterial agents. They are especially suitable for the treatment of diseases caused by the pathogens mentioned. The new compounds are also valuable intermediates for the manufacture of other useful substances.

Especially valuable are the compounds of the formula in which R stands for the radical of the formula -(CH,),,,H and m and n each stands for an integer from 0 to 5 and alk for a straight or branched lower alkylene radical separating the two nitrogen atoms by two to five carbon atoms, the compounds of the above-mentioned formula ll in which n and alk have the meanings given above and R represents a hydroxy-lower alkyl radical, especially the hydroxymethyl radical, the compounds of the above-mentioned formula [1 in which n and alk have the meanings given above, R stands for a di-lower alkyl-aminolower alkyl radical, especially a di-lower alkyl-amino-methyl radical, and their acid addition salts, and the compounds of the formula ll in which n and alk have the meanings given above and R stands for lower alkanoyl.

Especially preferred groups of compounds are those of the in which p stands for an integer from 2 to 4 and R for a hydrogen atom, those of formula III in which p has the mean-. ing given and R stands for a hydroxy-lower alkyl radical, especially for the hydroxymethyl radical, those of the formula III in which p has the meaning given and R represents a di-lower alkyl-arnino-lower alkyl radical, especially a di-lower alkylaminomethyl radical, and their acid addition salts, and the compounds of formula III in which p has the meaning given and R stands for a lower alkanoyl radical, such as the acetyl radical.

A specially good action against amoebae and schistosomes exert the l-[ 5-nitro-thiazolyl-( 2 1-2-oxo-tetrahydroimidazole, the l -[5-nitrothiazolyl-( 2) ]-2-oxo-hexahydropyrimidine and the l-[5-nitrothiazolyl-(2)]-2-oxo-3- acetyl-tetrahydroimidazole.

The new compounds are manufactured by known methods.

For example, the new compounds are obtained when a compound of the general formula where T, Z and R have the above meanings-is subjected to intramolecular condensation accompanied by elimination of hydrochloric acid and, if desired, in a compound so obtained the radical R is introduced into the three-position or the dimcycloalkane ring.

The intramolecular condensation (cyclisation) is preferably performed by heating, advantageously in the presence of a polar solvent, above all water, and/or in the presence of a condensing agent, especially a basic condensing agent such as an alkali metal acetate or carbonate, if desired in a suitable solvent, such as an acid amide, for example dimethylformamide.

According to another process for the manufacture of the new compounds a compound of the general formula where R and 2 have the above meanings and T is a thiazolyl-Z radical which is unsubstituted in position 5- is nitrated. Nitra tion is carried out in the manner known in thiazole chemistry, for example by treatment with a mixture of concentrated sulfuric and concentrated nitric acid or with the mixed anhydride of nitric acid and a carboxylic acid, such as acetic acid. Any phenyl groups present may be nitrated at the same time.

The introduction of a substituent R into a compound in which R is a hydrogen atom is performed in the known manner, for example in the manufacture of compounds in which the substituent R is an unsubstituted or substituted hydrocarbon radical of aliphatic character, such as a lower. alkyl radical which is unsubstituted or substituted by a hydroxyl group or by a free or substituted amino group, or a lower alkenyl or an araliphatic radical and in which the substituent R contains no hydroxyl or amino groups or in which any hydroxyl or amino groups present in R are separated from the cyclic nitrogen atom by at least two carbon atoms, by reaction with a; halide of the formula R--X in which R has the above meaning and X represents a halogen atom, such as a chlorine atom. If desired, this operation is performed with a metal salt such as' an alkali metal salt of the B-unsubstituted 2-oxo-tetrahydroimidazole, or in the presence of a basic condensing agent, especially a condensing agent capable of forming metal salts, such as an amide, hydride, hydrocarbon, hydroxide, alcoholate or carbonate of an alkali metal.

Compounds in which R is a methyl radical that carries a hydroxyl groi or a free or substituted amino group, especially a hydroxyrnethyl or secondary or tertiary aminomethyl radical are obtained by reaction with formaldehyde, if desired or required in the presence of ammonia or of an amine.

Introduction of the hydroxymethyl group is achieved by a simple reaction with formaldehyde, if desired in the form of a formaldehyde donor, such as trioxymethylene or paraforrnaldehyde, advantageously in the presence of a basic condensing agent, such as an alkali metal hydroxide or carbonate, or of a tertiary amine or quaternary ammonium hydroxide, such as triethylamine or benzyltrimethyl ammonium hydroxide.

The aminomethyl group is advantageously introduced by the Mannich reaction, for example with formaldehyde, with the use of a salt of ammonia or of an amine. Also in this case the formaldehyde may be used in the form of a donor, such as trioxymethylene or paraformaldehyde, if desired in the presence of an acid.

The introduction of an acyl radical in three-position of a 3- unsubstituted l-[ S-nitrothiazolyll-l ,3-diazacycloalkane is performed eg. by reaction of a compound of the formula in which T and Z have the meanings given above, with reactive derivatives of acids, above all the halides, such as chlorides or bromides, or their anhydrides. It is advantageous to use a condensing agent. Thus bases such as pyridine or acylate ions promote the reaction of the acid anhydrides, and bases, such as pyridine or alkali, for example sodium carbonate, promote the reaction of the acid halides.

The above-mentioned reactions are performed in the usual manner.

Depending on the reaction conditions and starting materials used, the final products having substituted or unsubstituted amino groups are obtained in the free form or in the form of their salts which are likewise included in the present invention. A resulting amine can be converted into a salt thereof in the usual manner by reaction with an organic or inorganic acid, especially one that is suitable for the formation of therapeutically acceptable salts. On the other hand, a resulting salt can be converted into the free compound in the usual manner, for example by treatment with a basic agent or ion exchange resin. Acids, suitable for the formation of therapeutically acceptable salts, are for instance hydrohalic, sulfuric or phosphoric acids, nitric or perchloric acid; alicyclic, aromatic or heterocyclic carboxylic or sulfonic acids such as formic, acetic, propionic, succinic, glycollic, lactic, malic, tartaric, citric, ascorbic, maleic, hydroxymaleic or pyruvic acid; phenylacetic, benzoic, para-aminobenzoic,. anthranilic, parahydroxybenzoic, salicyclic, para-aminosalicyclic or embonic acid, methanesulfonic, ethanesulfonic, hydroxy-ethanesulfonic, ethylenesulfonic acid, halogenbenzene-sulfonic, toluenesulfonic, naphthalenesulfonic acids or sulfanilic acid; methionine, tryptophan, lysine or arginine.

These or other salts of the new compounds, for example, the picrates, can also be used for purification of the amines obtained; the amines are converted intov salts, the salts are separated and the amines are liberated from the salts. In view of the close relationship between the free amino compounds and the amino compound in the form of a salt thereof, when ever a free amine is referred to in this context, a corresponding salt is also intended provided such is possible or applicable under the circumstances.

The invention further includes any variant of the present process in which an intermediate product obtainable at any stage of the process is used as starting material and any remaining steps are carried out, or the process is discontinued at any stage thereof, or in which a starting material is formed under the reaction conditions or is used in the form of a salt.

It is advantageous to use starting materials that give rise to the final products described above as being particularly valuable.

The starting materials used are known or, insofar as they are new, they can be prepared by known methods. Thus, for example, the nonnitrated compounds can be prepared in an analogous manner to that described above for the S-nitro compounds (except by the nitration process) starting from an analogous nonnitrated starting material.

The new compounds may be used for example in the form of pharmaceutical preparations which contain them in the free form or in the form of their salts in conjunction or admixture with an organic or inorganic solid process) starting liquid phannaceutical excipient suitable for enteral, parenteral or local administration. Suitable excipients are substances that do not react with the new compounds, for example water, gelatine, lactose, starches, magnesium stearate, .talcum, vegetable oils, benzyl alcohol, gums, polyalkylenegylcols, white petroleum jelly, cholesterol or other known medicinal excipient. The pharmaceutical preparations may be, for example, tablets, dragees, ointments or creams, or in liquid form solutions, suspensions or emulsions. They may be sterilized and/or contain assistants such as preserving stabilizing, wetting or emulsifying agents, salts for regulating the osmotic pressure, or buffers. They may also contain further therapeutically valuable substances, such as for example 2- sulfanilamido-6-chloropyrazine.

The above-mentioned products may also be used in conjunction with conventional animal fodders'or vehicles as fodders or additives to fodders in animal husbandry.

The following examples illustrate the invention.

EXAMPLE l g. of N-( 2-chlorethyl)-N'-[5-nitrothiazolyl-(2)]-urea in 1 liter of water are stirred and heated for 7 hours to the boil. The precipitate formed is filtered off and recrystallized from dimethylformamide-l-methanol, to yield I-[S-nitrothiazolyl- 2)-]-2-oxo-tetrahydro-imidazole of the formula in yellow crystals melting at 259-260 C.

The urea used as starting material may be prepared as follows:

A solution of 25 g. of 2-amino-5-nitrothiazole and 50 g. of 2-chlorethyl isocyanate in 250 cc. of tetrahydrofuran is heated in a closed vessel for 16 hours at 80 to 90 C. After cooling, I50 cc. of tetrahydrofuran are evaporated, the precipitate formed is suctioned off and thoroughly washed with warm isopropyl ether, to yield N-(2-chlorethyl)-N'-[5- nitrothiazolyl-(2)]-urea in crystals melting at 140 C. with decomposition.

The l-[ S-nitrothiazolyl-( 2 ]2-oxo-tetrahydro-imidazole described above can also be prepared by nitrating l- [thiazolyl-( 2) ]-2-oxo-tetrahydroimidazole.

EXAMPLE 2 25 g. of N-(2-ch1oropropyl)-N-[5-nitro-thiazolyl-(2)l-urea are boiled for 4 hours in a solution of 14 g. of sodium acetate in 200 cc. of water. The precipitate which forms is filtered ofi' and recrystallized from dimethyl formamide-l-ethanol. There is thus obtained the l-[5-nitro-thiazolyl-(2)l-2-oxo-5-methyltetrahydroimidazole of the formula EXAMPLE 3 22 g. of N-[2-chloro-butyl-(3) ]-N'-[5-nitro-thiazolyl-(2)]- urea are heated at 100 C. for 10 minutes with 13 g. of sodium acetate in 40 cc. of dimethyl formamide. There are then added 200 cc. of water, and the precipitate which forms is filtered off. The filter residue is washed with lN-sodium hydroxide solution and, for further purification recrystallized from dimethyl formamide-i-ethanol. There is obtained the 1-[5- nitrothiazolyl-(2)l-2-oxo-4:5-dimethyl-tetrahydroimidazole of the formula CH: CH5

in the form of yellow crystals of melting point 242243 C.

The urea used as starting material is prepared as follows:

14 g. of 2-amino-5-nitrothiazole are heated to 100 C. for 4 hours with 12 g. of 2-chloro-butyl-(3)-isocyanate in 100 cc. of absolute tetrahydrofuran. The solution is then evaporated to dryness under reduced pressure. The residue is recrystallized from ethanol to obtain N-[ 2-chloro-butyl-( 3 ]-N-[ 5-nitrothiazolyl-(2)]-urea in the form of crystals melting at 195 C.

EXAMPLE 4 15 g. of 1-[4-phenyl-thiazolyl-(2)1-[2-oxo-tetrahydroimidazole are introduced into 50 cc. of concentrated sulfuric acid in such manner that the temperature does not rise above 10 C. After that, 7 g. of concentrated nitric acid are slowly added dropwise, and the mixture stirred at room temperature for 5 hours. The reaction mixture is poured on to ice. A precipitate forms which is filtered off and recrystallized from dimethyl forrnamide. The 1-[4-para-nitrophenyl-5-nitrothiazolyH 2)l-2-oxo-tetrahydroimidazole of the formula OzN is obtained in the form of yellow crystals of melting point 286-28 8 C.

The 1- [4-phenyl-thiazolyl-( 2 ]-2-oxo-tetrahydroimidazole used as starting material can be prepared as follows:

10 g. of Z-chloro-ethyl-isocyanate are added to 10 g. of 2- amino-4-phenyl-thiazole in 50 cc. of dimethyl formamide and the mixture heated at C. for 2 hours. The mixture is then cooled treated with water, and the precipitate that forms recrystallized from ethanol. There is thus obtained N-[4-phenyl-thiazolyl-(2)]-N-(2-chlor-ethyl)-urea of melting point l73-174 C.

10 g. of the urea are heated at 1 10 C. for 30 minutes with 6 g. of sodium acetate in cc. of dimethyl formamide. There are then added 300 cc. of water. The precipitate which forms is recrystallized from aqueous dimethyl formamide to obtain 1-[4-phenyl-thiazolyl-(2)]-2-oxo-tetrahydro-imdazole in the form of white crystals melting at 250-252 C.

EXAMPLE 5 A mixture of 16.0 g. of 2-amino-4-methyl-5nitrothiazole, nitro-thiazolyl-(ILO g. of fi chlorethylisocyanate, 5.0 g. of

potassium carbonate, and 150 cc. of acetone is stirred while 1 is obtained in the form of yellow crystals of melting point 24l-243C.

EXAMPLE 6 10 g. of l-[5-nitrothiazolyl-(2)l-2-oxo-tetrahydroimidazole are dissolved in 40 cc. of dimethylformamide. 50 cc. of a 30 percent formaldehyde solution in water are then added followed by 0.5 cc. of an 80 percent solution of benzyltrimethylammoniumhydroxide in methanol. After the reaction mixture has been allowed to stand for 2 hours at room temperature, 1- [5-nitrothiazolyl-( 2 ]-2-oxo-3-hydroxymethyltetrahydroimidazole of the formula is precipitated by the addition of water. After recrystallization from a mixture of dimethylformamide and water, the compound melts at l85l87 C.

EXAMPLE? 10 g. of l-[-nitrothiazolyl-(2))-2-oxo-tetrahydroimidazole, 1.4 g. of paraformaldehyde and 3.8 g. of

is obtained in the form of crystals melting at 278-280 C.

EXAMPLE 8 8.7 g. of l-[4-methyl-5-nitrothiazolyl-(2)]-2-oxotetrahydroimidazole are dissolved in 30 cc. of dimethylformamide at C. 2 drops of an 80 percent solution of benzyltrimethylammoniumhydroxide in methanol and 50 cc. of formalin of 40 percent strength are then added. After 1 hour, 200 cc. of water are added to the solution and the precipitate is recrystallized from methanol to yield l-[4-methyl-5-nitrothiazolyl-( 2) ]-2-oxo-3-hydroxymethyl-tetrahydroimidazole of the formula CH; TN CHr-OH: oml IL-CHn-OH in the form of yellow crystals melting at l53-l54 C.

EXAMPLE 9 A mixture of IO g. of l-[5-nitrothiazolyl-(2)]-2-oxotetrahydroimidazole, 1.4 g. of paraformaldehyde and 3.5 g. of methylamine hydrochloride in 80 ml. of dimethylformamide is heated for 3 hours at 120 C. with stirring. After cooling the reaction mixture, the precipitate is filtered and recrystallized from dimethylformamide-i-ethanol. l-[5-nitrothiazolyl-(2)]-2- 0x0-3-methylamino-methyl-tetrahydroimidazole hydrochloride of the formula .Q a a...

is obtained in the form of crystals melting at 260 C. with decomposition.

EXAMPLE lO 1.2 g. of sodium hydride are added to ml. of dimethyl sulfoxide and the whole is heated for 2 hours at 70 C. with stirring. The reaction mixture is cooled to room temperature, 10 g. of l-[5-nitrothiazolyl-(2)]-2-oxo-tetrahydroimidazole in 50 ml. of dimethyl sulfoxide are added dropwise and the batch stirred for 30 minutes. 8.0 g. of diethylaminoethyl chloride are then added dropwise. After stirring for 4 hours at 2025 C. excess sodium hydride is destroyed by the addition of a little ethanol. On the addition of water, a brown precipitate settles which is filtered and dissolved in 2N acetic acid. The solution is treated with active carbon, filtered and rendered neutral by the addition of sodium carbonate. 1-[5-nitrothiazolyl-(2)]-2- oxo-3-(B-diethylaminoethyl)-tetrahydroimidazole of the forprecipitates in the form of crystals melting at l40-l4l C.

EXAMPLE 1 l 2 drops of an 80 percent solution of benzyltrimethyl-ammoniumhydroxide in methanol and then 30 ml. of a formaldehyde solution of 30 percent strength are added to a solution of 8.0 g. of l-[S-nitrothiazolyl-(Z)]-2-oxo-5-methyltetrahydroimidazole in 30 ml. of dimethylforrnamide at 80 C. The batch is cooled to room temperature and after 8 hours 200 ml. of water are added. A precipitate of l-[5- nitrothiazolyl-( 2- ]-2-oxo-3-hydroxymethyl-5-methyltetrahydroimidazole of the formula CH3 7' ['N III-THZ 10i LN N-CHaOH settles which, after recrystallization from methanol, melts at l70-l74 C.

EXAMPLE 12 13.0 g. of N-[5-nitrothiazolyl-(2)]-N'-( 3-ch1oropropyl)- urea are added to a solution of 7.0 g. of sodium acetate in 150 cc. of water and stirred for 3 hours at 90 C. The insoluble share is filtered off and recrystallized from dimethylformamide, to yield crystalline 1-[5-nitro-thiazolyl-(2)]-2-oxo-hexahydropyrimidine of the formula N Ci CH2 0... Li J...

melting at 289 C.

The urea used as starting material can be prepared thus:

A mixture of 14.4 g. of 2-amino-5-nitrothiazole, 13.0 g. of 3-chloropropyl, isocyanate and 100 ml. of dioxane is heated for 5 hours at 100 C. The insoluble share is then filtered. The filtrate is evaporated and the residue recrystallized from aqueous dioxane, to yield crystalline N-[S-nitro-thiazolyl-(Z)]-N- (3-chloropropyl)-urea melting at 168- l 70 C.

EXAMPLE 13 CE: I Cz CH2 oNl which melt at l58-l60 C.

EXAMPLE 14 A mixture of g. of l-[5-nitrothiazolyl-(2)]-2-oxotetrahydroimidazole and 50 ml. of acetic anhydride is boiled for 4 hours and then allowed to cool to room temperature. The precipitate formed is filtered off and recrystallized from dimethyl-formamide-l-ethanol, to yield l-[S-nitrothiazolyl- (2)1-2-oxo-3-acetyl-tetrahydroimidazole of the formula in yellow crystals melting at l63"-166 C.

. EXAMPLE 15 The new compounds can be used in the form of pharmaceutical preparations, the daily dose being 0.1 to 10 mg. per kg. of body weight. Administration can be carried out, for example, in the form of capsules containing the desired amount of the active substance, above all l[5-nitrothiazolyl-(2)]-2-oxo-hexahydropyrimidine.

For use as additives to animal fodder, for example chickenfeed, the new compounds, especially l-[5-nitrothiazolyl-(2)]- 2-oxo-hexahydropyrimidine can be mixed, for example, with cerelose (content of active compounds, for example, 0.1 to 1 percent, preferably 0.5 percent). This preliminary mix can be added to the fodder in the usual manner, advantageously so that the mixture contains about 0.01 percent of the pyrimidine derivative.

EXAMPLE 16 Tablets containing 500 mg. of l-[5-nitrothiazolyl-(2)]-2- oxo-tetrahydroimidazole may be prepared with the following ingredients:

. M th Half of the wheat starch is pasted ,with four times the quantity of water on a waterbath. 1-[5-nitro-thiazolyl-( 2 ]-2-oxotetrahydroimidazole is homogeneously mixed with the remaining starch, then kneadedwith the paste and with a sufficient quantity of water to form a plastic mass. The colloidal silicic acid with hydrolyzed starch is then worked in portions.

The plastic mass is passed through a sieve having a 4-5 mm. mesh and dried at 45" C. The dried granulate is passed through a sieve of 0.8 l .4 mm. mesh and the remaining disintegrating and lubricating agents are then added. After further homogenization tablets having a diameter of 1 1.5 mm. and weighing 625 mg. are compressed in the conventional manner.

in the same manner, tablets containing l-[S-nitrothiazolyl- (2)l-2-oxo-3-(hydroxymethyl)-tetrahydroimidazole can be prepared.

EXAMPLE 1? 7.8 g. of B-chloro-tertiary butylisocyanate in 15 ml. of acetone are added dropwise to 9.0 g. of Z-amino-S-nitrothiazole and 5.0 g. of anhydrous potassium carbonate in 60 ml. of acetone, and the mixture heated for minutes at 45 C. ml. of ZN-hydrochloric acid are then added. The precipitate which forms is dissolved in 40 ml. of dimethyl formamide and the solution, after addition of 12.0 g. of sodium acetate, heated at 100 C. for 30 minutes. After cooling to room temperature, 100 ml. of water are added, and the resulting precipitate recrystallized from alcohol. There is obtained the l-[S-nitro-thiazolyl-(2)]-2-oxo-4,4-dimethyl-tetrahydroimidazole of the formula in the form of yellow crystals melting at 221-224 C.

The B-chloro-tertiary butylisocyanate (boiling at 5356 C. under a pressure of 22 mm. Hg) used as starting material can be obtained from B-hydroxy-tertiary butylamine by reaction with thionyl chloride to form the ,B-chloro-tertiary butylamine hydrochloride, and treatment of the latter with phosgene by the method of W. Siefken, Ann. 562, 75 et seq. 1949).

EXAMPLE 18 2.5 g. of l-[5-nitro-thiazolyl-(2)1-2-oxo-hexahydropyrimidine, 0.33 g. of paraformaldehyde, and 0.9 g. of dirnethylamine hydrochloride in 25 cc. of dimethyl fon'namide are heated at 100 C. for 2 hours. The precipitate is filtered off with suction and recrystallized from ZN-hydrochloric acid.

20.0 g. of l-[5-nitro-thiazolyl-(2)]-2-oxo-tetrahydroimidazole and 80.0 g. of chloracetic anhydride are heated together at 120 C. for 4 hours. After cooling, the reaction mixture is treated with 200 ml. of alcohol and filtered. The filter residue is recrystallized from aqueous dimethyl formamide. The resulting crystals of l-[5-nitro-thiazolyl-(2)]-2-oxo- 3-(chloroacetyl)-tetrahydro-imidazole of the formula C ll I O, h

melt at l70-173 C.

EXAMPLE 20 10.0 g. of l-[-nitro-thiazolyl-(2)]-2-oxo-tetrahydroimidazole are stirred and heated at 150 C. for 4 hours with 20.0 g. of benzoic anhydride. The reaction mixture is then recrystallized from dimethyl formamide to obtain l-[5-nitrothiazolyl-(2)]-2-oxo-3-benzoyl-tetrahydro-imidazole of the formula in the form of yellow crystals melting at 273 C.

EXAMPLE 21 10.0 g. of l-[4-methyl-5-nitrothiazolyl-(2)]-2-oxotetrahydro-imidazole are heated at the boil for 4 hours with 50 ml. of acetic anhydride. After cooling, a precipitate forms which is recrystallized from dioxan. There is obtained in this manner 1 4-methyl-5-nitrothiazolyl-( 2) 1-2-oxo-3-acetyltetrahydro-imidazole of the formula EXAMPLE 22 At 10 C., 20 ml. of concentrated nitric acid are stirred into a solution of 5.0 g. of l-[thiazolyl-(2)]-3-acety1-2-oxotetrahydro-imidazole in 50 ml. of concentrated sulfuric acid. The batch is stirred for 3 hours at 10 C., then poured on ice. The precipitate which forms is filtered off and recrystallized from methanoHdimethylformamide. There is obtained in this manner the l-[S-nitro-thiazolyl- (2)1-2-oxo-3-acetyltetrahydro-imidazole of melting point 166 C. which is identical with the product described in example 14.

The l-[thiazolyl-(2)1-3-acetyl-2-oxo-tetrahydro-imidazole used as starting material can be prepared by acetylating l- [thiazolyl-(2)1-2-oxo-tetrahydro-irnidazole with acetic anhydride. The compound melts at 185 C.

EXAMPLE 23 10.0 g. of 1-[4-(para-nitrophenyl)-5-nitro-thiazqlyl-(2)]-2- oxo-tetrahydro-imidazole and 50 ml. of acetic anhydride are stirred while being heated at C. for 4 hours. After cooling, the precipitate that has fonned is filtered off and recrystallized from aqueous dimethylformamide. There is obtained the l-[4-(para-nitrophenyl)-5-nitro-thiazolyl-(2)l-2- 0x0-S-acetyl-tetrahydro-imidazole of the formula --N IL-C-CHa OZN s II in the form of yellow crystals of melting point 245-247 C.

EXAMPLE 24 2.0 g. of l-[5=nitrothiazolyl-(2)l-2-oxo-hexahydropyrimidine in 5.0 ml. of dimethylformamide are heated at C. for 2 hours with 5.0 ml. of acetic anhydride. After cooling, 50 ml. of water are added, and the batch extracted with 50 ml. of methylene chloride. The methylene chloride layer is separated and evaporated under vacuum. There remains a crystalline residue of 1-[5-nitrothiazo1yl-(2)]-2- oxo-3-acetyl-hexahydropyrimidine of the formula which after being recrystallized fizam a mixture of methylene chloride and petroleum ether melts at 220-223 C.

EXAMPLE 25 10.0 g. of 1-[ 5-nitrothiazolyl-(2)l-oxo-tetrahydro-imidazole are heated at C. for 4 hours with 50.0 g. of butyric anhydride. After cooling, ethanol is added and the batch filtered. The filtrate is evaporated, and the residue recrystallized from aqueous ethanol. The 1-[5-nitrothiazolyl-(2)]-2-oxo-3-butyryl-tetrahydro-imidazole of the formula EXAMPLE 2,6

3 ml. of concentrated nitric acid are added at room temperature to a solution of g. of 1-[thiazoly1-(2)]-2-oxo-3-(l3- diethylamino-ethyl)-tetrahydro-imidazole in 75 ml. of concentrated sulfuric acid. The reaction mixture is stirred for 8 hours at room temperature, then poured on to ice and carefully neutralized by the addition of ammonia. A precipitate settles out which is recrystallized from alcohol to yield 1-[5-nitrothiazolyl-( 2 l-2-oxo'3-()3-diethylaminoethyl )-tetrahydroimidazole of the formula I CzH in the form of yellow crystals melting at 140141C.

The l-[thiazolyl-( 2 ]-2-oxo-3-( B-diethylaminoethyl tetrahydro-imidazole used as starting material is prepared as follows:

17 g. of l-[thiazolyl-(2)l-2-oxo-tetrahydro-imidazole are added to a suspension of 2.4 g. of sodium hydride in 200 ml. of toluene, and the whole is heated for 2 hours at 90 C. The reaction mixture is cooled to 50 C., and g. of B- diethylamino-ethyl chloride are added dropwise. The batch is heated for 4 hours at 90 C., 50 ml. of alcohol are then added at room temperature, the reaction mixture evaporated in vacuo, and the residue distilled in a high vacuum. 1- [Thiazolyl-(2)]-2-oxo-3-(B-diethylaminoethyl)-tetrahydroimidazole distills at 163-165 C. under 0.1 mm. pressure.

EXAMPLE 27 1.6 g. of concentrated nitric acid are added to a solution of 4.0 g. of 1-[thiazolyl-(2)]-3-methyl-2-oxo-tetrahydroimidazole in ml. of concentrated sulfuric acid and the mixture stirred for 4 hours at room temperature. The reaction mixture is poured on ice. The precipitate which forms is tiltered off and washed with acetone. There is obtained in this manner l-[ 5-nitrothiazolyl-( 2 ]-3-methyl-2-oxo-tetrahydroimidazole-(2) of the formula which melts at 239-24lC.

The 1-[ thiazoly1-( 2 ]-3-methyl-2-oxo-tetrahydro-imidazole may be prepared as follows:

To a solution of 15.0 g. of 2-amino-thiazole in 150 ml. of boiling ether are slowly added dropwise 16.0 g. of B- chlorethylisocyanate. When the mixture is allowed to stand for a while, the N -[thiazolyl-(2)]-N -(B-chlorethyl)-urea crystallizes. After being recrystallized from alcohol it melts at l 42-1 43 C.

10 g. of the chlorethyl urea are boiled for 4 hours with 300 ml. of water. The precipitate which forms is filtered off and recrystallized from dimethylformamide-l-methanol. There is obtained l-[thiazolyl-(2)]-2-oxo-tetrahydro-imidazole in the form of white crystals of melting point 209-210 C.

10.0 g. of l-[thiazolyl-(2)]-2'oxo-tetrahydro-imidazole are added to a suspension of 1.5 g. of sodium hydride in 100 ml. of toluene and the mixture stirred while being heated at 80 C. for 1 hour. There are then slowly added 8.0 g. of dimethyl sulfate, and, after 4 hours, the batch cooled to room temperapressure. The residue is recrystallized from methanol and 1- [thiazolyl-(Z)]-3-methyl-2-oxo-tetrahydro-imidazole obtained in the form of crystals melting at l28-130 C.

Example 28 Chick Starter containing 0.005% of Compound I and 0.0075% of Compound II as coccidiostatic ingredients:

I. 1-[5-nitrothiazolyl (2) ]-2-ox0- Grams tetrahydroimidazole 50. 0 II. 2-sulfanilamido-6-chloropyrazine 75. 0 Formula: Pounds Corn meal 1, 103. 0 Soybean meal, 44% protein 660. 0 Alfalfa meal 30. 0 Dicalcium phosphate 40. 0 Limestone meal 10. 0 Salt 5. 0 Fish meal, 60% protein 40. 0 Stabilized fat 60. 0 Dried whey 40. 0 Manganese sulfate 0. 5 Zinc oxide 0. 3

d l-methionine 1. 5 Vitamin premix 10. 0

Total 2, 000. 8

10 lb. of the vitamin composition contain: 16,000,000 Vit. A, 1,000,000 l.U. Vit. D, 5,000 [.U. Vit. E acetate, 6 g.

Vit. K 6 mg. Vit. B 3 g. riboflavin, 30 g. niacin, 5 g. calcium pantothenate and 100 g. ethoxyquin, made up to 10 lb. with cornmeal.

The compounds 1 and 11 are first premixed with a small amount (about 2 lb. of the feed mixture (which is supplied as 5 such by the manufacturer). The premix is increased to about lb. and then thoroughly mixed with the main batch in a horizontal mixer.

EXAMPLE 29 A premix containing 1 percent of 1-[5-nitro-thiazolyl-(2)1- 2-oxo-tetrahydroimidazole is prepared as follows (for 1,000 l ingredients 1-l5-nitrothiazolyl-(2 )]-2-oxotetrahydroimidazole 10.00 g. Sugar, Confectioners 100.00 g. Soybean Feed, Solvent Extracted 890.00 g.

The ingredients are thoroughly mixed in appropriate mixing equipment. The premix is then added to the feed formula in desired quantities.

The feed formula is prepared as previously shown; the

vitamin premix has the following ingredients Vitamin A 4,000,000 USP units d-Pantothenic acid fl 31l1 Vitamin 8,, 0.003 g.

Vitamin D, 2,000,000 USP units Vitamin E 2,500 l units whereas the mineral premix contains the following essential minerals Manganese 6.00 percent Iodine 0.12 percent Iron 2.00 percent Copper 020 percent Zinc 2.00 percent g Cobalt 0.02 percent Calcium 25.20 percent in which 2 represents a member selected from the group con sisting of straight and branched lower alkylene separating the two nitrogen atoms by two to five carbon atoms and straight and branched lower alkylene separating the two nitrogen atoms by two to five carbon atoms and substituted by at least one member selected from the group consisting of lower alkenyl, phenyl, lower alkyl-phenyl, lower alkoxy-phenyl, halogenphenyl, trii'luoromethyl-phenyl, nitrophenyl, phenyllower alkyl, lower alkyl-phenyl-lower alkyl, lower alkoxyphenyl-lower alkyl, halogeno-phenyl-lower alkyl, trifluoromethyl-phenyl-lower alkyl and nitrophenyl-lower alkyl, R represents a member selected from the group consisting of hydrogen, lower alkyl, lower alkenyl, phenyl-lower alkyl, lower alkylphenyl-lower alkyl, lower alkoxy-phenyl-lower alkyl, halogeno-phenyl-lower alkyl, trifluoromethyl-phenyllower alkyl, nitrophenyl-lower alkyl, hydroxy-lower alkyl, lower alkanoyl, halogenated lower alkanoyl, benzoyl, lower alkyl'benzoyl, lower alkoxy-benzoyl, halogeno-benzoyl, trifluoro-methyl-benzoyl, aminobenzoyl, nitrobenzoyl, phenyl-lower alkanoyl, lower alkyl-phenyl-lower alkanoyl, lower alkoxy-phenyl-lower alkanoyl, halogenophenyl-lower alkanoyl, trifluoromethyl-phenyl-lower alkanoyl, aminophenyllower alkanoyl, nitrophenyl-lower alkenoyl, phenyl-lower allower alkylfuroyl,

kenoyl, lower alkyl-phenyl-lower alkenoyl, lower alkoxyphenyl-lower alkenoyl, halogeno-phenyl-lower alkenyol,

trifluorometllykphenyl lower alkenoyhaminophenyl-lower alkenoylz nitrophenyldower alkenoyl, pyfidoyl, lower alkylpyridoyl, lower alkoxyqpyridoyl, halogenopyridoyl, trifluoromethyl-pyridoyl-aminopyridoyl, nitropyridoyl, furoyl, lower alkoxy-furoyl, halogenofuroyl, trifluoromethylfuroyl, aminofuroyl, nitrofuroyl, thiophenecarbony], lower alkylthiophenecarbonyl, lower alkoxythiophenecarbonyl, halogeno-thiophenecarbonyl, trifluoromethyl-thiophenecarbonyl, aminothiophene-carbonyl and nitrothiophenecarbonyl and a radical of the formula in which R and R each stands for a member selected from the group consisting of hydrogen, lower alkyl, lower alkenyl, lower cycloalkyl and, when taken together, alkylene, monooxa-alkylene and mono-aza-alkylene having from four to eight carbon atoms, alk' for lower alkylene and R, stands for a member selected from the group consisting of hydrogen,

lower alkyl, lower alkenyL phenyl, lower alkylphenyl, lower alkoxyphenyl, halogenophenyl, trifluoromethyhphenyl and nitrophenyl.

2. A compound as claimed in claim 1, said compound having the formula in which alk stands for lower alkylene separating the two nitrogen atoms by two to five carbon atoms, n stands for an integer from 0 to 5 and R for a member selected from the group consisting of hydrogen, lower alkyl, hydroxy-lower alkyl, dilower alkylamino-lower alkyl, lower alkanoyl and benzoyl.

3. A compound as claimed in claim 1, said compound being l-[thiazolyl-(2)]-2-oxo-tetrahydroimidazole.

4. A compound as claimed in claim 1, said compound being l-[4-phenyl-thiazolyl-(2)1-2-oxo-tetrahydroimidazole.

5. A compound as claimed in claim 1, said compound being l-[thiazolyH 2) ]-3-acetyl-2-oxo-tetrahydroirnidazole.

6. A compound as claimed in claim 1, said compound being l-[thiazolyl-( 2 ]-2 oxo-3-(B-diethylaminoethyl tetrahydroimidazole.

7. A compound as claimed in claim 1, said compound being 1-[thiazolyl-( 2 ]-3-methyl-2-oxo-tetrahydroimidazole.

as so. 1.1..

7 3 I UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3, 627,777 Dated December 1 1971 Inventor(s) PAUL SCHMIDT El AL It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 15; claim 1, delete the left-hand side of the formula and insert Signed and sealed this 19th day of September 1972.

(SEAL) Attest:

EDWARD M-FLETQHERJR. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents 

2. A compound as claimed in claim 1, said compound having the formula
 3. A compound as claimed in claim 1, said compound being 1-(thiazolyl-(2))-2-oxo-tetrahydroimidazole.
 4. A compound as claimed in claim 1, said compound being 1-(4-phenyl-thiazolyl-(2))-2-oxo-tetrahydroimidazole.
 5. A compound as claimed in claim 1, said compound being 1-(thiazolyl-(2))-3-acetyl-2-oxo-tetrahydroimidazole.
 6. A compound as claimed in claim 1, said compound being 1-(thiazolyl-(2))-2-oxo-3-( Beta -diethylaminoethyl)-tetrahydroimidazole.
 7. A compound as claimed in claim 1, said compound being 1-(thiazolyl-(2))-3-methyl-2-oxo-tetrahydroimidazole. 